What is a BC01-R
Chris Zach
cz at alembic.crystel.com
Sun Jan 2 18:24:27 CST 2022
Oh ok, you answered it. It's from an 11/20. Weird since I never had one,
Alan Frisbee, didn't you have an 11/20 next to your CR11 reader when I
was over at your place 30 years ago?
Still the question: Anyone need it and willing to trade it for an 8/L
serial cable and card?
On 1/2/2022 11:35 AM, Nigel Johnson Ham via cctalk wrote:
> The original serial interface in the PDP-11 (later 11/20) was four cards
> in a specially-wired backplane slot. There was an M782(1?) interrupt
> controller, a data path module whose number I forget, and the interface.
> That card brought out the cable to the outside world. IOW they were
> combining existing modules to get the serial function, and adding the
> interface card to connect to the outside world.
>
> The later DL11 of course did it all on one module which fitted into an
> SPC slot and had a 40-pin Berg connector on the side facing the Unibus
> slots for the cable take-off.
>
> It's been along time since I took the factory training course on the
> PDP11/20, and I believe the ones I worked on in the lab at Maynard that
> already had a DL11 in them.
>
> cheers,
>
> Nigel
>
>
> Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
> Amateur Radio, the origin of the open-source concept!
> Skype: TILBURY2591nw.johnson at ieee.org
>
>
>
> On 2022-01-02 11:24, Chris Zach via cctalk wrote:
>> Hm. Ok, so what was it for then? Any specific pdp11, or just the
>> serial plug for a weird Unibus sync modem cardset?
>>
>> I'm thinking of cutting it down and using it as a 20ma current loop
>> plug for one of my pdp8/L's. If anyone wants to trade it for a real
>> DEC 8/I or 8/L card or if this thing has some sort of value let me know.
>>
>> C
>>
>>
>> On 1/1/2022 8:55 PM, Bill Degnan via cctalk wrote:
>>> On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via cctalk <
>>> cctalk at classiccmp.org> wrote:
>>>
>>>> Found here:
>>>>
>>>> http://www.pdp8online.com/bklatt/43.jpg
>>>
>>>
>>> https://www.vintagecomputer.net/browse_thread.cfm?id=249
>>>
>>> Bill
>>>
>>>>
>>>>
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